Coolant Level Control
WARNING: This page is about a different car, the 2002 Oldsmobile Aurora and 2001 Oldsmobile Aurora. However, it is still accessible from the selected car via links, so may be relevant.
The engine cooling system contains an engine coolant level switch to alert the driver in the event of a coolant loss. When the engine coolant level switch reads a low coolant level in the fill tank, the switch opens. Ignition 3 voltage is supplied by the instrument panel cluster (IPC) on the low coolant level indicator control circuit. When the IPC detects a high low coolant level indicator control circuit signal for more than 30 seconds, the IPC sends a Class 2 message to the drivers information center (DIC) to display the LOW COOLANT LEVEL message. The ground path is provided via the underhood fuse block to G103.